The Last Stand, a mutant claps his hands and blasts a shockwave across a battlefield. In a theater somewhere, Sunny Jung ...

Clapping creates sound through air pressure, not just hand impact. Shape, speed, and skin softness change the sound.

A Helmholtz resonator consists of an enclosed cavity of air — like the inside of a glass bottle, or the space between clapping hands — with an opening connected to the cavity by a neck.